Hi there! First of all congratulations on finishing the cylinder challenge, this one is certainly a pain to do.

I'm going to start with the normal cylinders:

First of all your lines are great overall throughout the challenge, you aren't afraid to draw confident lines even if that means that sometimes your lines miss the mark, or they overshoot a bit. This is exactly the appraoch you need to take; as you keep practicing like this your accuracy will get better.

Second is that, as I can see on your cylinders, you understand that the end farther away from us is wider and smaller, but there's something else that I think you haven't realized. The rate on which this farther end gets smaller in comparison to the starting end affects the change of degree between the ellipses.

This means that if the farther end gets only a little bit smaller, the change of degrees will only make it a little bit wider. And the same happens when the end gets a lot smaller. The farther end would get wider as well.

Cylinders have a lot of variety to them just as asked, so good job on that!

Now about the cylinders on boxes:

-First thing I want to say is that the orientation of your boxes is a little bit restricted. Take a look at this diagram so it gives you more ideas about how to vary a box.

-Second thing is that I've seen a pattern on boxes that don't have faces as squares, in which you tend to ignore the minor axis of the box to make it try to fit the face of the box, such as in box 178.

Now this is something I stop seeing in the later boxes as you get better at eyeballing squares in perspective, but I want to make sure you understand that when drawing an ellipse in this exercise, you should always start ghosting it by keeping the minor axis in mind, as the correct ellipse will always follow the minor axis.

-Your boxes through the challenge have pretty good convergences, so great job on that! The only thing I've noticed is that you have a tendency to rush a bit your hatching, so don't forget to put care on every line.

Overall pretty good work! You've had issues through the challenge, but by the end of it you solved it, and both your cylinders and cylinders on boxes end up pretty solid. Make sure though that you practice boxes on your warmups on different orientations as I mentioned earlier, as they are important too. Once again congratulations on finishing the cylinder challenge, and good luck with lesson 6!